On this parts fiche the 02112-05257 is the most specified component.
The Lock Washer is the lowest priced item on this Rh Handle Switch (gs750b) schematic.
Parts such as the Rh Handle Switch (gs750b): Nut,lever Fittng, Button, Lock Washer, Switch Assy,stop are included in the Gs750c 1977 (b) Usa (e03) Rh Handle Switch (gs750b) parts fiche.
